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Micro-kinked domains in mica under spherical nanoindentation
Journal of Structural Geology 32 (2010) 1029
Contents lists available at ScienceDirect
Journal of Structural Geology journal homepage: www.elsevier.com/locate/jsg
Photograph of the Month
Micro-kinked domains in mica under spherical nanoindentation
The photograph shows a scanning electron microscopy, SEM (XL 30, FEI Corporation, Hillsboro, OR), image of kinked domains in muscovite mica (Custer County, South Dakota – Geoprime Earth Materials Co.), formed under a spherical nanoindenter tip with a radius of 13.5 mm. The width of the photograph is about 8 mm. In mica, during loading, basal plane dislocations form incipient kink bands (IKBs), which eventually sunder into permanent kink bands (KBs) at greater stresses (Barsoum et al., 2004, 2003; Basu et al., 2009). By repeatedly indenting the same location, we demonstrated the role of IKBs in nonlinear elasticity and energy dissipation during the deformation of single crystal mica. The photograph also shows the massive rotation of kinked domains possible: the kink band in the center of the photograph has a different orientation than the domain on the right. Spherical nanoindentation stress–strain analysis (Basu et al., 2006), allowed us to estimate the stresses at which the IKBs and KBs form. This experimental observation should help structural geologists take IKBs into account while modeling the micro-scale deformation behavior of geological formations containing layered silicates.
References Barsoum, M.W., Murugaiah, A., Kalidindi, S.R., Zhen, T., 2004. Kinking nonlinear elastic solids, nanoindentations and geology. Phys. Rev. Lett. 92, 255508-1. Barsoum, M.W., Zhen, T., Kalidindi, S.R., Radovic, M., Murugahiah, A., 2003. Fully reversible, dislocation-based compressive deformation of Ti3SiC2 to 1 GPa. Nat. Mater. 2, 107–111. Basu, S., Moseson, A., Barsoum, M.W., 2006. On the determination of spherical nanoindentation stress strain curves. J. Mater. Res. 21 (10), 2628–2637. Basu, S., Zhou, A., Barsoum, M.W., 2009. On spherical nanoindentations, kinking nonlinear elasticity of mica single crystals and their geological implications. J. Struct. Geol. 32 (8), 794–801.
Sandip Basu* Department of Materials Science and Engineering, Rutgers University, Piscataway, NJ 08854, USA Corresponding author. E-mail address: [email protected] (S. Basu) Michel W. Barsoum Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA Available online 18 July 2009
0191-8141/$ – see front matter doi:10.1016/j.jsg.2009.05.014
Contents lists available at ScienceDirect
Journal of Structural Geology journal homepage: www.elsevier.com/locate/jsg
Photograph of the Month
Micro-kinked domains in mica under spherical nanoindentation
The photograph shows a scanning electron microscopy, SEM (XL 30, FEI Corporation, Hillsboro, OR), image of kinked domains in muscovite mica (Custer County, South Dakota – Geoprime Earth Materials Co.), formed under a spherical nanoindenter tip with a radius of 13.5 mm. The width of the photograph is about 8 mm. In mica, during loading, basal plane dislocations form incipient kink bands (IKBs), which eventually sunder into permanent kink bands (KBs) at greater stresses (Barsoum et al., 2004, 2003; Basu et al., 2009). By repeatedly indenting the same location, we demonstrated the role of IKBs in nonlinear elasticity and energy dissipation during the deformation of single crystal mica. The photograph also shows the massive rotation of kinked domains possible: the kink band in the center of the photograph has a different orientation than the domain on the right. Spherical nanoindentation stress–strain analysis (Basu et al., 2006), allowed us to estimate the stresses at which the IKBs and KBs form. This experimental observation should help structural geologists take IKBs into account while modeling the micro-scale deformation behavior of geological formations containing layered silicates.
References Barsoum, M.W., Murugaiah, A., Kalidindi, S.R., Zhen, T., 2004. Kinking nonlinear elastic solids, nanoindentations and geology. Phys. Rev. Lett. 92, 255508-1. Barsoum, M.W., Zhen, T., Kalidindi, S.R., Radovic, M., Murugahiah, A., 2003. Fully reversible, dislocation-based compressive deformation of Ti3SiC2 to 1 GPa. Nat. Mater. 2, 107–111. Basu, S., Moseson, A., Barsoum, M.W., 2006. On the determination of spherical nanoindentation stress strain curves. J. Mater. Res. 21 (10), 2628–2637. Basu, S., Zhou, A., Barsoum, M.W., 2009. On spherical nanoindentations, kinking nonlinear elasticity of mica single crystals and their geological implications. J. Struct. Geol. 32 (8), 794–801.
Sandip Basu* Department of Materials Science and Engineering, Rutgers University, Piscataway, NJ 08854, USA Corresponding author. E-mail address: [email protected] (S. Basu) Michel W. Barsoum Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA Available online 18 July 2009
0191-8141/$ – see front matter doi:10.1016/j.jsg.2009.05.014